This study examined and compared surface of human dentine after acidic etching with hydrogen peroxide, phosphoric acid liquid and gel. Surface demineralization of dentin is necessary for a strong bond of adhesive at dental surface. Split human teeth were used. After application of mentioned substances at dentin level measures of the contact angle and surface morphology were employed. Surface morphology was analyzed with the help of scanning electron microscopy and atomic force microscopy. Liquid phosphoric acid yielded highest demineralization showing better hydrophobicity than the rest, thus having more contact surface. Surface roughness are less evident and formed surface micropores of 4 �m remained open after wash and air dry providing better adhesive canalicular penetration and subsequent bond.

Evolution of hernia surgery has led to polymeric biomaterials for replacement or reinforcement of the abdominal wall. Their selection, according to the structure and porosity of the material, is directly dependent on the surgical procedure used and interaction between material and abdominal viscera. The objective of the paper is to establish a protocol for the selection of hernia mesh fixation materials based on polymer structure related to the surgical procedure used. The biomaterials that promote infection should be avoided and those that do not provide a long-term mesh placement should be used in combination with other devices to compensate for this fault. In conclusion, is much better to adapt the fixation biomaterials used in clinical practice to the specific surgical procedure, given the physical and chemical characteristics of these polymers, in order to reduce the morbidity associated with this type of surgery.

In recent years, researchers have been able to identify new materials with special properties that can be used in major medical fields. Magnesium-based materials used in orthopedics are an important alternative, being the third generation of biocompatible materials. A biodegradable magnesium-based material has the ability to degrade at a certain rate, is biocompatible, and together with other alloying elements ensures osteointegration. Mg-0.5Ca-xY biodegradable alloys will be developed in an induction melting furnace using ceramic crucibles, melting at 710-720 °C in the controlled atmosphere of 5.0 Ar. SEM analyses and X-ray diffraction reveals the size distribution of Mg-sized grains, with a hexagonal lattice and formation of compounds with the two alloying elements: Mg2Ca, Mg2Y, Mg24Y5uniformly arranged in the α-Mg matrix. The alloying elements influence the microstructure, the size of the α-Mg grains decreasing considerably.

Broad introduction and development of polymeric materials in abdominal hernia surgery led to the emergence and identification of secondary complications due to interaction between prosthetic material and human tissue. Whether identification of these reactions has led to the placement instructions of the prostheses into the wall structures of adbomen, there is no clear rule on fixation materials of these prosthesis; they generally follow the recommendations of the prosthesis materials.There are some situations in which the faulty choice of fixing materials can compromise such surgery, followed by chronic septic complications and negative effect on quality of life of these patients and increased risk of recurrence.The choice of fixing materials considering the structural characteristics of polymeric threads can prevent chronic suppuration secondary to this type of surgery.